yield in Ruby

One of Ruby’s most exciting features is passing a block of code to a function. A built-in keyword in Ruby allows you to pass a block of codes to a function.

In this article, we will discuss the block and yield in Ruby. Also, we will look at some examples and explanations to make the topic easier.

A yield is a built-in keyword that allows you to pass a block. Now a block is a code line enclosed by curly braces ({}).

Let’s take a look at an example relevant to this topic.

Use the yield Keyword in Ruby

The example below illustrates how we can use the keyword yield in a Ruby program. Have a look at the below example code.

def MyMethod
  puts 'This is from the method.'

  # Using the yield keyword
  yield
  puts 'Passing the block again.'
  yield
end
MyMethod { puts 'This is a block.' }

In the above example, we passed the block {puts "This is a block"} to the function MyMethod using the keyword yield.

When you run the above codes, you will get the below output in your console.

This is from the method.
This is a block.
Passing the block again.
This is a block.

So the difference between the block and yield is that the block is a collection of codes to perform specific tasks, and the yield is a keyword that allows you to pass that block in a function.

When a function gets a yield keyword, it will run the block that passed into it and then continue with the other lines.